Ok, I think I did something rally bad. I am unable to install emacs. 
Here's the output :
============================================================
These are the packages that would be merged, in order:

Calculating dependencies   ... done!
[ebuild  N    ] net-libs/liblockfile-1.06-r2  0 kB
[ebuild  N    ] app-emacs/emacs-common-gentoo-1.2  USE="X -emacs22icons" 0 kB
[ebuild  N    ] app-editors/emacs-23.1  USE="X alsa dbus gif gpm gtk jpeg png svg tiff xpm -Xaw3d -gzip-el -hesiod -kerberos -m17n-lib -motif -sound -source -toolkit-scroll-bars -xft" 30,648 kB
[ebuild  N    ] virtual/emacs-23  0 kB

Total: 4 packages (4 new), Size of downloads: 30,648 kB

Would you like to merge these packages? [Yes/No] 
>>> Verifying ebuild manifests

>>> Starting parallel fetch

>>> Emerging (1 of 4) net-libs/liblockfile-1.06-r2
 * liblockfile_1.06.tar.gz RMD160 SHA1 SHA256 size ;-) ...               [ ok ]
 * checking ebuild checksums ;-) ...                                     [ ok ]
 * checking auxfile checksums ;-) ...                                    [ ok ]
 * checking miscfile checksums ;-) ...                                   [ ok ]
>>> Unpacking source...
>>> Unpacking liblockfile_1.06.tar.gz to /var/tmp/portage/net-libs/liblockfile-1.06-r2/work
 * Applying liblockfile-1.06-glibc24.patch ...
  [ ok ]
 * Applying liblockfile-1.06-respectflags.patch ...
  [ ok ]
 * Applying liblockfile-orphan-file.patch ...
  [ ok ]
 * Running eautoreconf in '/var/tmp/portage/net-libs/liblockfile-1.06-r2/work/liblockfile-1.06' ...
 * Running aclocal ...
  [ !! ]

 * Failed Running aclocal !
 * 
 * Include in your bugreport the contents of:
 * 
 *   /var/tmp/portage/net-libs/liblockfile-1.06-r2/temp/aclocal.out

 * ERROR: net-libs/liblockfile-1.06-r2 failed:
 *   Failed Running aclocal !
 * 
 * Call stack:
 *     ebuild.sh, line   49:  Called src_unpack
 *   environment, line 2802:  Called eautoreconf
 *   environment, line  894:  Called eaclocal
 *   environment, line  833:  Called autotools_run_tool 'aclocal'
 *   environment, line  378:  Called die
 * The specific snippet of code:
 *           die "Failed Running $1 !";
 * 
 * If you need support, post the output of 'emerge --info =net-libs/liblockfile-1.06-r2',
 * the complete build log and the output of 'emerge -pqv =net-libs/liblockfile-1.06-r2'.
 * The complete build log is located at '/var/tmp/portage/net-libs/liblockfile-1.06-r2/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/net-libs/liblockfile-1.06-r2/temp/environment'.
 * S: '/var/tmp/portage/net-libs/liblockfile-1.06-r2/work/liblockfile-1.06'

>>> Failed to emerge net-libs/liblockfile-1.06-r2, Log file:

>>>  '/var/tmp/portage/net-libs/liblockfile-1.06-r2/temp/build.log'

 * Messages for package net-libs/liblockfile-1.06-r2:



Any idea ?